Have your parents done any investigation of the cost and availability of suitable off-campus housing near each of these campuses? There will be logistical issues to transporting you to and from campus that should be considered. It seems to me that your parents should be investigating that since they want to live with you. Again, I’m not familiar with Duke but I would think it would be easier to find family housing to lease in the suburbs around Pomona vs. UCLA. Also traffic will be less congested and campus parking more available. The easier and faster it is to transport you back and forth to campus, the more often you’ll be able to do it, so that’s an important consideration.
All of these schools will have lots of clubs and events that will provide an opportunity for socializing. Here’s a link to the website for the Associated Students of Pomona College: https://aspc.pomona.edu/. There is also a Facebook page for PEC (Pomona Events Committee.) You can see from the event calendar that a lot of activities take place after 5:00 pm. This is why I emphasize the question of logistics. A bigger school like UCLA will have even more clubs and events but they may be more difficult to get to from off campus.
In an earlier post I described the Pomona sponsor group program. I suggest you email the Office of Housing and Residential Life and ask whether a freshman living off campus can participate in a sponsor group. I have no idea, but maybe they have a way to make this work. https://www.pomona.edu/administration/housing-residence-life. Good luck with your decision and finishing your IB exams.